Luminescence performance of Cr~(3+) doped and Cr~(3+) , Mn~(4+) co-doped La_2ZnTiO_6 phosphors

摘要

Cr3+ doped and Cr3+, Mn4+ co-doped La2ZnTiO6 phosphors were prepared using solid-state reaction method and their luminescence performance has been investigated. La2ZnTiO6: Cr3+ phosphor exhibits red luminescence band centred at 740 nm when excited with light in spectral range from ultraviolet to blue and green (300 nm-500 nm). Both emissions at 740 nm (Cr3+) and at 710 nm (Mn4(+)) can be observed in the Cr3+, Mn4+ co-doped phosphor and its total luminescence intensity excited at 337 nm is enhanced to 1.6 times with the introduction of Mn4+ ions. The ratio of emission intensity at 710 nm to that at 740 nm in the co-doped phosphor increases monotonically as excitation wavelength increases from 330 to 400 nm. The performance of the developed phosphors in present work indicates that they might be used in indoor cultivation of LEDs and wavelength detection.